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1 Caisson or lacuna, i.e. deep panel sunk in a ceiling, dome, soffit, or vault, often decorated in the centre with a stylized flower or similar embellishment, as on the undersides of Composite and Corinthian cornices. A ceiling, etc., with coffers is said to be coffered, and coffering is an arrangement of coffers.

2 Cavity in a thick wall, pier, etc., filled with rubble and other material, often box-like compartments formed by the facing-stones and cross- or bonding-stones.

Subjects: Architecture.

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